Intrinsic structural transitions of the pyramidal I <c + a> dislocation in magnesium

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)104-107
Journal / PublicationScripta Materialia
Volume116
Online published18 Feb 2016
Publication statusPublished - 15 Apr 2016
Externally publishedYes

Abstract

The stability of a mixed <c + a> dislocation on the pyramidal I plane in magnesium is studied using molecular dynamics simulations. The dislocation is metastable and undergoes a thermally-activated transition to either a sessile, basal-dissociated <c + a> or a sessile basal-dissociated <c> dislocation plus an <a> dislocation. The transition is intrinsic to pure magnesium and occurs with an energy barrier of ∼ 0.3 eV. The transformed structure is also consistent with experimental evidence in Ti and Zr, where pyramidal I slip is more prevalent. Enhancing the ductility of magnesium by stabilizing <c + a> slip on pyramidal I planes thus appears unlikely to be viable.

Research Area(s)

  • Dislocations, Magnesium, Molecular dynamics simulations, Plasticity